166441265531939 has 2 divisors, whose sum is σ = 166441265531940. Its totient is φ = 166441265531938.

The previous prime is 166441265531927. The next prime is 166441265531953. The reversal of 166441265531939 is 939135562144661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166441265531939 is a prime.

It is not a weakly prime, because it can be changed into another prime (166441265531909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83220632765969 + 83220632765970.

It is an arithmetic number, because the mean of its divisors is an integer number (83220632765970).

Almost surely, 2^{166441265531939} is an apocalyptic number.

166441265531939 is a deficient number, since it is larger than the sum of its proper divisors (1).

166441265531939 is an equidigital number, since it uses as much as digits as its factorization.

166441265531939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125971200, while the sum is 65.

The spelling of 166441265531939 in words is "one hundred sixty-six trillion, four hundred forty-one billion, two hundred sixty-five million, five hundred thirty-one thousand, nine hundred thirty-nine".